Australia has a cane toad problem. The amphibians are not native to the continent; they were introduced in the state of Queensland back in 1935 as pest control in the sugar fields. But then the toads got out of control and became pests themselves.

Cane toads (Rhinella marina) protect themselves with poison, and that poison kills any animals that eat the toads. That’s made a big dent in populations of native animals such as snakes, goannas and adorable marsupials called quolls.